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Increasing the power efficiency of an IEEE802.11a power amplifier

Research output: ResearchConference contribution

Original languageEnglish
Title of host publicationVehicular Technology Conference 2005 (VTC 2005-Spring)
Publisher or commissioning bodyInstitute of Electrical and Electronics Engineers (IEEE)
ISBN (Print)0780388879
StatePublished - May 2005
Event61st Vehicular Technology Conference 2005 (VTC 2005-Spring) - Stockholm, Sweden
Duration: 1 May 2005 → …


Conference61st Vehicular Technology Conference 2005 (VTC 2005-Spring)
Period1/05/05 → …


OFDM modulation is extensively used in many applications. However, it also exhibits high peak-to-average power ratios (PAPR) requiring the associated transmit amplifier to have a very large linear region. This linear amplifier does therefore have poor power efficiency. To reduce the PAPR, clipping and filtering was carried out at baseband. This paper investigates the impact that clipping has on the resultant power efficiency and BER. The simulations show that when the input back-off (IBO) dynamically controls the input average power in every OFDM symbol, for a 64-subcarrier QPSK OFDM signal, the power efficiency can be improved by 55% without increasing the bit error rate

Additional information

Conference Proceedings/Title of Journal: IEEE 61st Vehicular Technology Conference, 2005 (VTC 2005-Spring) Rose publication type: Conference contribution Sponsorship: The work reported in this paper has formed part of the Wireless Enablers area of the Core 3 Research Programme of the Virtual Centre of Excellence in Mobile & Personal Communications, Mobile VCE, whose funding support, including that of EPSRC, is gratefully acknowledged Terms of use: Copyright © 2005 IEEE. Reprinted from Proceedsing of IEEE 61st Vehicular Technology Conference, Spring 2005. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it

    Research areas

  • OFDM, clipping, Power amplifier, Power efficiency


61st Vehicular Technology Conference 2005 (VTC 2005-Spring)

Duration1 May 2005 → …

Event: Conference

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